This Bluetooth receiver can convert non-Bluetooth for iPhone/iPod docking station into a Bluetooth-enabled dock, just by connecting this product to a sound box equipped with a 30pin male connector dock. Transmission distance up to 10m. Wireless Bluetooth connection reduces cable clutter around the dock.
Play your favorite songs in your device through a wireless Bluetooth connection. Support Bluetooth-enabled digital products, such as for iPad, for iPod, for iPhone, Bluetooth cell phone, Bluetooth PC, for PSP. Complies with Bluetooth 2.0. Plug and Play. Support A2DP V1.2, compatible with all devices enabled with A2DP stereo Bluetooth.

Specifications:
Output: Bluetooth
Support file: Bluetooth V.2.0 A2DP V.1.2
Connector: 30pin
Transmission distance: Up to 33 feet (10meters) away
Color: White, Black (Optional)
Package weight: 15g
Size: 46 x 37 x 9mm / 1.81 x 1.46 x 0.35inch
Application: Dadicated for Apple speaker

Package Included:
1 x Bluetooth Music Receiver(The dock is not included)

Note:
Pls check your Sounddock before order! Just plug your for iPhone 4/4S to your speaker dock, if your speaker can play music or your 4/4s phone can charge, that means this Bluetooth receiver is the right adapter for your speaker.